Down-to-earth actress and mama Kate Winslet gave her son, Joe Alfie, 4, a piggyback ride home from school yesterday in the Big Apple. It's hard to believe the stunning Titanic star is a married mother of two who has made numerous films since the epic tale of Rose and Jack left us sobbing in theaters. But, she's teaming up with Leonardo DiCaprio and her hubby, director Sam Mendes, for her latest film Revolutionary Road. While Kate is known for shining on the silver screen, it seems she sparkles most in her role as mom. Her lil look-a-like shares her plump pout, creamy complexion and inquisitive expression. The Oscar winner is also mommy to Mia, 7, whose father is Jim Threapleton.